﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Security.Cryptography;

namespace Aliyeye.Car.Net.Utility
{
    public class JhEncrypt
    {
        /// <summary> 
        /// 构造方法 
        /// </summary> 
        public JhEncrypt()
        {
        }
        /// <summary> 
        /// 使用缺省密钥字符串加密 
        /// </summary> 
        /// <param name="original">明文</param> 
        /// <returns>密文</returns> 
        public static string Encrypt(string original)
        {
            return Encrypt(original, "JASONHEUNG");
        }
        /// <summary> 
        /// 使用缺省密钥解密 
        /// </summary> 
        /// <param name="original">密文</param> 
        /// <returns>明文</returns> 
        public static string Decrypt(string original)
        {
            return Decrypt(original, "JASONHEUNG", System.Text.Encoding.Default);
        }
        /// <summary> 
        /// 使用给定密钥解密 
        /// </summary> 
        /// <param name="original">密文</param> 
        /// <param name="key">密钥</param> 
        /// <returns>明文</returns> 
        public static string Decrypt(string original, string key)
        {
            return Decrypt(original, key, System.Text.Encoding.Default);
        }
        /// <summary> 
        /// 使用缺省密钥解密,返回指定编码方式明文 
        /// </summary> 
        /// <param name="original">密文</param> 
        /// <param name="encoding">编码方式</param> 
        /// <returns>明文</returns> 
        public static string Decrypt(string original, Encoding encoding)
        {
            return Decrypt(original, "JASONHEUNG", encoding);
        }
        /// <summary> 
        /// 使用给定密钥加密 
        /// </summary> 
        /// <param name="original">原始文字</param> 
        /// <param name="key">密钥</param> 
        /// <param name="encoding">字符编码方案</param> 
        /// <returns>密文</returns> 
        public static string Encrypt(string original, string key)
        {
            byte[] buff = System.Text.Encoding.Default.GetBytes(original);
            byte[] kb = System.Text.Encoding.Default.GetBytes(key);
            return Convert.ToBase64String(Encrypt(buff, kb));
        }

        /// <summary> 
        /// 使用给定密钥解密 
        /// </summary> 
        /// <param name="encrypted">密文</param> 
        /// <param name="key">密钥</param> 
        /// <param name="encoding">字符编码方案</param> 
        /// <returns>明文</returns> 
        public static string Decrypt(string encrypted, string key, Encoding encoding)
        {
            byte[] buff = Convert.FromBase64String(encrypted);
            byte[] kb = System.Text.Encoding.Default.GetBytes(key);
            return encoding.GetString(Decrypt(buff, kb));
        }
        /// <summary> 
        /// 生成MD5摘要 
        /// </summary> 
        /// <param name="original">数据源</param> 
        /// <returns>摘要</returns> 
        public static byte[] MakeMD5(byte[] original)
        {
            MD5CryptoServiceProvider hashmd5 = new MD5CryptoServiceProvider();
            byte[] keyhash = hashmd5.ComputeHash(original);
            hashmd5 = null;
            return keyhash;
        }

        /// <summary> 
        /// 使用给定密钥加密 
        /// </summary> 
        /// <param name="original">明文</param> 
        /// <param name="key">密钥</param> 
        /// <returns>密文</returns> 
        public static byte[] Encrypt(byte[] original, byte[] key)
        {
            TripleDESCryptoServiceProvider des = new TripleDESCryptoServiceProvider();
            des.Key = MakeMD5(key);
            des.Mode = CipherMode.ECB;

            return des.CreateEncryptor().TransformFinalBlock(original, 0, original.Length);
        }

        /// <summary> 
        /// 使用给定密钥解密数据 
        /// </summary> 
        /// <param name="encrypted">密文</param> 
        /// <param name="key">密钥</param> 
        /// <returns>明文</returns> 
        public static byte[] Decrypt(byte[] encrypted, byte[] key)
        {
            TripleDESCryptoServiceProvider des = new TripleDESCryptoServiceProvider();
            des.Key = MakeMD5(key);
            des.Mode = CipherMode.ECB;

            return des.CreateDecryptor().TransformFinalBlock(encrypted, 0, encrypted.Length);
        }

        /// <summary> 
        /// 使用给定密钥加密 
        /// </summary> 
        /// <param name="original">原始数据</param> 
        /// <param name="key">密钥</param> 
        /// <returns>密文</returns> 
        public static byte[] Encrypt(byte[] original)
        {
            byte[] key = System.Text.Encoding.Default.GetBytes("JASONHEUNG");
            return Encrypt(original, key);
        }

        /// <summary> 
        /// 使用缺省密钥解密数据 
        /// </summary> 
        /// <param name="encrypted">密文</param> 
        /// <returns>明文</returns> 
        public static byte[] Decrypt(byte[] encrypted)
        {
            byte[] key = System.Text.Encoding.Default.GetBytes("JASONHEUNG");
            return Decrypt(encrypted, key);
        }

        /// <summary> 
        /// 使用缺省密钥解密数据 
        /// </summary> 
        /// <param name="encrypted">密文</param> 
        /// <returns>明文</returns> 
        public static string DecryptString(byte[] encrypted)
        {
            byte[] key = System.Text.Encoding.Default.GetBytes("JASONHEUNG");
            byte[] temp= Decrypt(encrypted, key);

            System.Text.Encoding encoding = System.Text.Encoding.Default;
            return encoding.GetString(temp);
        }
        
        /// <summary>
        /// 使用缺省密钥加密数据
        /// </summary>
        /// <param name="password">明文</param>
        /// <returns>密文</returns>
        public static byte[] EncryptPassword(string password)
        {
            byte[] bytes = new UnicodeEncoding().GetBytes(password);
            SHA1 sha = new SHA1CryptoServiceProvider();
            return sha.ComputeHash(bytes);
        }

    }
}
